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After-work adventures

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« on: March 20, 2016, 09:33:31 pm »

I've been going out in the evenings, when the light isn't great, but have kicked up some interesting things. More 'just interesting' than of lapidary use (also might have run into a snag with my new employers regarding what I can and cannot do with rock from their property... mostly because I'm asking for permission, which no one ever does, which means no one's thought of an answer yet or even knows who has the authority to give one. If the snag sticks, then I'll GPS my way onto local BLM in-holdings and see what's around there.)

But for now, this was the result of an adventure to a construction site, where a new water tower will be built soon.
There's a thick layer of lavender tuff that contains a variety of interesting things. My favorite is the streaks of thin, brilliantly green crystal/mineral exposed by the fractured rock. So far it's all been paper thin. A mineral sample, not a cut-able rock. 'It must be copper' is what comes to mind, but someday I'd love to send a sample and a giant question mark to the folks who test rock and find out what gives it its color.

From the same location, a layer of tiny dendritic crystals. This is going to be an 'office rock.' I found out the person who had my office before me kept toys in it for the village kids, so they all automatically invite themselves in. Opportunity to teach them a little something about the place they live in, I think!

This is from the same place, but it's not native to it. There's an ash terrace on a red fin of upthrust basalt that was graded and graveled for construction 30-odd years ago. This rock was left behind by someone. I found it fractured and carted the other half home 15 years ago; finding the other half right where I thought it should be was refreshing (memory doesn't always line up to reality.) It's a fine-grain river rock with a pale green rind, and the ripples outward from the point of impact are pretty interesting to me.

The local pictographs:
We're fairly certain they're somewhat real. No guarantee some enterprising kid hasn't added to them, but the very faint and layered geometric patterns are probably authentic (the space ship is up for debate.) Unfortunately they were done on a thin, smooth layer that has since flaked/been chipped off the original basalt monolith (not surprising; these are right beside a dirt track that's been in use for 200 years.)
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« Reply #1 on: March 21, 2016, 09:59:07 pm »

Way cool!
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Dave, a certified Rockaholic

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« Reply #2 on: March 22, 2016, 10:50:50 am »

The green might be copper, but there are other possibilities. When I first saw the photo, my first thought was garnierite (a nickel-bearing material).
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